Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fdf1ad4c88d921…

MALICIOUS

PDF

70.9 KB Created: 2021-02-14 11:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0ccb9b437424ee90d2fe593072309215 SHA-1: 18a6b09845b5ba68876933f1c7401aa33161ae7e SHA-256: e2fdf1ad4c88d92156c2c2869ee3cb8e72282407a331a4475e88f0d71271668a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a reference to 'Anatomy of crab', likely a lure. The presence of numerous links on disposable hosting further supports a redirection or phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=anatomy+of+crab In PDF document text
    • http://rewidixuwilakiw.22web.org/blackberry_passport_silver_android_os.pdfIn PDF document text
    • http://bu-markett.com/37793055410m5y6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_601133dc31204.pdfIn PDF document text
    • http://trokot-shtorki.online/37428267736g886g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500208/normal_5fca43499b8ff.pdfIn PDF document text
    • http://esmoney.site/gafivf01qh.pdfIn PDF document text
    • http://raisinslabs.club/154573481617qmc8.pdfIn PDF document text
    • http://lorowivo.22web.org/56939662224.pdfIn PDF document text
    • http://hookup157.site/50324082132non5q.pdfIn PDF document text
    • http://freshnatur.fun/word_blocks_picture6wnez.pdfIn PDF document text
    • http://alcexpress3.xyz/where_are_worldedit_schematics_saved5pl3t.pdfIn PDF document text
    • http://tosety.xyz/diccionario_etimolgico_espaol_e_hispnicoi0wtl.pdfIn PDF document text
    • http://jufumabenosenup.iblogger.org/fitbit_versa_spec_sheet.pdfIn PDF document text
    • http://nizumewuminal.iblogger.org/apache_parquet_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://texaliborobiko.epizy.com/likebobevowutuf.pdfIn PDF document text
    • http://jipumenovimol.rf.gd/tetugepazesokebeve.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 5048 bytes
SHA-256: 80b9ab572c1f8e067f51828ff799fef1c1d6a15a0c2fc8cdda226b60a7c8ad27
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 10280 bytes
SHA-256: 5b6bfa501d8fef8484b2de3406941b04a4692d7c852fd34eca4f575a92588378

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